H. Ernst

Nuclear magnetic resonance on oriented192Ir in Fe and Ni

The hyperfine interaction of192Ir nuclei as dilute impurities in Fe and Ni has been investigated with NMR on oriented nuclei. With the use of highly dilute and pure alloys the line widths could be reduced so far that the quadrupole splitting of192IrFe and192IrNi could be resolved. Taking hyperfine anomalies into account the ground state nuclear moments of192Ir are deduced as |μ|=1.924(10)μN andQ=2.36(ll) b. The hyperfine field of IrNi was investigated as a function of the Ir concentrationc between 0.01 at % and 5 at %. The dependence ofHHF onc was found to be significantly smaller than that reported from Mössbauer effect measurements. Forc=0.01 at %HHF=−454.7(2.3)kG is deduced. The resonance shift with an external magnetic field has been studied precisely, yieldingK=0.012(23) andK=0.026(12) for the Knight-shift of192Ir in Fe and Ni, respectively.

Nuclear orientation of 109Cd and 115mCd in Cd

The quadrupole interaction frequencies of 109CdCd and 115mCdCd have been measured by low-temperature nuclear orientation as +110(4) MHz and -102(12) MHz, respectively. The electric field gradient of CdCd and the quadrupole moment of the 52+ 245 keV level of 111Cd are deduced.